JP3555171B2 - Back support device for vehicle seat - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a back support device for a vehicle seat, such as a lumbar support and a pelvis support.
[0002]
[Prior art]
A back support device in a vehicle seat is generally well known as a lumbar support. As shown in the publication "Automotive Engineering Handbook, Vol. 6, pp. 1-25 (published by the Society of Automotive Engineers of Japan on September 30, 1983)", the lumbar support is attached to the back frame by moving the base end back and forth. The torsion bar spring is rotatably supported in the direction, a pressing plate attached to the tip of the torsion bar spring, and a drive motor for rotating the torsion bar spring. In the lumbar support, the torsion bar spring is rotated forward by rotating the drive motor forward if necessary, and the back of the seated person is pressed by advancing the pressing plate, and the drive motor is rotated in reverse. By rotating the torsion bar spring backward and retreating the pressing plate, it functions to eliminate the pressing on the back of the seated person.
[0003]
[Problems to be solved by the invention]
By the way, in the lumbar support, since the pressing plate exists only at the center in the left and right width directions of the back pad constituting the seat back, the torsion bar spring is rotated forward to advance the pressing plate. In this case, only the part of the back pad where the pressing plate abuts bulges forward to give the occupant a sense of incongruity, and the entire back of the occupant is difficult to fit over the back of the occupant, and the On the contrary, you may feel tired.
[0004]
Therefore, an object of the present invention is to solve the above-described problems by using a plurality of airbags instead of the conventional pressing plate.
[0005]
[Means for Solving the Problems]
The present invention, Ru back support device der for supporting the back of the seated person is assembled to the back frame of the seat back constituting the seat with the seat back. The back support device according to the present invention includes a first airbag positioned at a central portion in the left and right width direction of the back frame, and a second and a third airbag positioned at each side in the left and right width direction of the back frame. of the air bag, the air pump to perform an air supply and discharge for the respective air bag, the opening and closing valves selectively opened at the time of driving the same air pump and said air pump are respectively disposed in the communication passage of the air bag Each of the airbags is attached to a plate of a predetermined width extending in the left-right direction with each end fixed to the left and right portions of the back frame via respective support plates supporting the back of each bag body, and is attached to each other. It is characterized by being located in parallel .
[0006]
[Action and Effect of the Invention]
In the vehicle seat provided with the back support device having such a configuration, the supply and exhaust of air to and from the first airbag located at the center and the second and third airbags located at the left and right sides are controlled by controlling them. By adjusting the inflation and shrinkage of the seat, it is possible to adjust the support strength, elasticity, etc. of the back of the occupant, but these airbags cover almost the entire surface of the back pad in the width direction due to the arrangement portion. Since the back pad is swelled and retracted, only a substantially central portion of the back pad, such as a conventional pressing plate, is swelled and retracted, so that the seated person does not feel uncomfortable. In addition, by adjusting the degree of inflation and deflation of each airbag independently or related to the seated person's body shape, the seat back is fitted to the back of the seated person, eliminating fatigue for the seated person. Can be done. For example, in the case of a person with a large waist, the amount of inflation of the second and third airbags on both sides is reduced, and in the case of a person with a small waist, the amount of inflation of the second and third airbags on both sides is reduced. By increasing the size, the seat back can be more fitted to both backs.
[0007]
【Example】
Hereinafter, a back support device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a vehicle seat equipped with a back support device according to the present invention, and FIG. FIG. 1 is an exploded perspective view of a seat back constituting a vehicle seat. The vehicle seat includes a seat back 10a, a seat cushion 10b, and a headrest 10c. The lower part of the seat back 10a is attached to the rear part of the seat cushion 10b via a reclining mechanism so as to be rotatable in the front-rear direction, and the headrest 10c is attached to the top of the seat back 10a so as to be vertically adjustable. It is attached.
[0008]
2, 3 and 7, the seat back 10a includes a back frame 11, a back pad 12, a back board 13, and a back cover 14. And the back pad 12 is disposed at the front, and is entirely covered with a back cover 14.
[0009]
The back frame 11 includes a frame 11a formed by a pipe, a plurality of S springs 11b, and a pair of left and right pad receiving wires 11c. And is stretched in the horizontal direction. Each pad receiving wire 11c is welded to the frame portion of the frame body 11 and protrudes forward. The pad receiving wire 11c receives the back pad 12 arranged forward together with the S springs 11b, and the left and right sides of the seat back 10a. Unit. The back frame 11 is provided with a lumbar support 20, which is an example of the back support device according to the present invention. As shown in FIGS. 1 to 7, the lumbar support 20 includes three airbags 21, 22, 23, an air pump 24, three electromagnetic valves 25a, 25b, 25c, and a control circuit 26. I have.
[0010]
The airbags 21 to 23 are different in size but have substantially the same configuration. The first airbag 21 is located at the center in the left and right width direction of the back frame 11, and the second and third airbags 22 and 23 are located at the center. The back frame 11 is disposed on the left and right sides in the width direction. The first airbag 21 includes a bag body 21a, a pair of support plates 21b and 21c, and a hinge 21d. The bag body 21a is of a horizontally long shape in which the longitudinal side surface has an inverted triangular pyramid shape, and both support plates 21b and 21c have substantially the same size as the front and rear surfaces of the bag body 21a. The upper edges are connected to each other via a hinge 21d so as to be opened and closed. Mounting plates 21e and 21f are fixed to the inner surfaces of the support plates 21b and 21c, respectively, and a mounting plate 21g is fixed to the outer surface of one of the support plates 21b. A mounting belt 21h is fixed to both front and rear surfaces of the back body 21a, and the back body 21a is supported by the support plates 21b and 21c in a state where the mounting belt 21h is hung on the mounting plates 21e and 21f. .
[0011]
The second airbag 22 and the third airbag 23 are different in size from the first airbag 21 but have the same structure, and include a bag body 22a, 23a and a pair of support plates 22b, 23b, 22c, 23c. A hinge (not shown) similar to the hinge 21d of the first airbag 21 is a main component.
[0012]
In these three airbags 21 to 23, the band-shaped plate 27 is inserted between the outer surfaces of the support plates 21b, 22b, and 23b and the mounting plates 21g, 22g, and 23g fixed thereto. 27, in this state, each end is fixed to the left frame portion 11a1 and the right frame portion 11a2 of the frame 11a of the back frame 11, and the first airbag 21 is attached to the lower portion of the back pad 12 in the left-right width direction. The second airbag 22 and the third airbag 23 are located at the center, and are located below the back pad 12 on the left and right sides in the left-right width direction.
[0013]
As shown in FIG. 2, the air pump 24 is fixed to the lower portion of the right frame portion 11a2 of the frame 11a of the back frame 11, and the electromagnetic valves 25a, 25b, 25c are stored in the box 25d in the lower frame. It is fixed to the right corner of the portion 11a3. As shown in FIG. 6, the air pump 24 includes a pump main body 24a and a drive motor 24b, and is connected to each of the electromagnetic valves 25a to 25c and each of the airbags 21 to 23 via an air pipe. Each of the electromagnetic valves 25a to 25c is a normally closed valve.
[0014]
The control circuit 26 includes switches 26c, 26d, and 26e for energizing the electromagnetic valves 25a to 25c and the electromagnetic relays 26a and 26b. Each of the switches 26c to 26e is a seesaw type manual operation automatic reset type normally open contact type switch, and is disposed on the side of the seat cushion 10b. The electromagnetic relays 26a and 26b selectively energize the drive motor 24b of the air pump 24 in the forward and reverse directions to rotate the drive motor 24b in the forward and reverse directions. The switches 26c to 26e correspond to the electromagnetic valves 25a to 25c, respectively. When the switches 26c to 26e are not operated, the electromagnetic valves 25a to 25c are in a non-energized state, and the electromagnetic relays 26a and 26b and the drive The motor 24b is also in a non-energized state. Reference numeral 26f indicates a box that houses both electromagnetic relays 26a and 26b.
[0015]
In the control circuit 26, when the switches 26c to 26e are not operated, the electromagnetic valves 25a to 25c are closed, and the air pump 24 is not driven. In this state, when the first operation portions 26c1 to 26e1 of the switches 26c to 26e are respectively pushed and operated, the solenoid valves 25a to 25c are energized and opened by the solenoids, and the first electromagnetic relay 26a is energized to the coil. Then, the drive motor 24b of the air pump 24 is energized to rotate the air pump 24 in the forward direction to supply air to the airbags 21 to 23 through the electromagnetic valves 25a to 25c. When the pushing operation of each of the switches 26c to 26e is released in this state, the switches 26c to 26e automatically return to stop the energization, and the above operation is stopped. In this state, when the second operation portions 26c2 to 26e2 of the switches 26c to 26e are respectively pushed and operated, the solenoid valves 25a to 25c are energized and opened by the solenoids, and the second electromagnetic relay 26b And the motor is closed, the drive motor 24b is energized, and the air pump 24 is rotated in the reverse direction to discharge the air in the airbags 21 to 23 through the electromagnetic valves 25a to 25c. When the pushing operation of each of the switches 26c to 26e is released in this state, the switches 26c to 26e automatically return to stop the energization, and the above operation is stopped.
[0016]
In the vehicle seat equipped with the lumbar support 20 having such a configuration, the air supply to and exhaust from each of the airbags 21 to 23 is controlled by pressing and operating the switches 26c to 26e constituting the control circuit 26. The expansion and contraction of 21 to 23 and their degree can be adjusted independently. When inflating each of the airbags 21 to 23, the inner side plates 21c to 23c are rotated forward, whereby each of the side plates 21c to 23c inflates the contact portion of the back pad 12 forward. Deform. When the airbags 21 to 23 are to be contracted, the inner side plates 21c to 23c are rotated rearward, whereby the portion of the back pad 12 with which the side plates 21c to 23c abut is retracted rearward. The deformation caused by the bulging is returned to the original state.
[0017]
As described above, in the lumbar support 20, the inflation and contraction of each of the airbags 21 to 23 are adjusted independently of each other, and each part of the back pad 12 with which each of the airbags 21 to 23 abuts is inflated and retracted. By doing so, it is possible to adjust the support strength, elasticity, etc. of the back of the seated person, but these airbags bulge and recede over the entire left and right width directions of the back pad 12 due to the arrangement portion. Therefore, there is no possibility that the seat pad is discomforted by bulging and retreating only a substantially central portion of the back pad like a conventional pressing plate. In addition, for example, as shown in FIG. 7A, in the case of a person M having a large waist, the amount of inflation of the second airbag 22 and the third airbag 23 on both sides is reduced, and FIG. As shown in ()), in the case of a person m with a small waist circumference, the inflating amounts of the second airbag 22 and the third airbag 23 on both sides are increased, so that the seat back 10a with respect to the back of both M and m. Can be fitted more.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle seat equipped with a lumbar support boat as a back support device according to one embodiment of the present invention.
FIG. 2 is an exploded perspective view of a seat back constituting the vehicle seat.
FIG. 3 is a vertical sectional side view of the seat back.
FIG. 4 is a plan view showing an attached state of each airbag constituting the lumbar support to a back frame.
FIG. 5 is an exploded perspective view of the airbag.
FIG. 6 is a circuit diagram of a control circuit constituting the lumbar port.
FIG. 7 is a cross-sectional plan view of the seat back showing an operation state of the lumbar support.
[Explanation of symbols]
10a ... seat back, 10b ... seat cushion, 10c ... headrest, 11 ... back frame, 12 ... back pad, 13 ... back board, 14 ... back cover, 20 ... lumbar support, 21, 22, 23 ... air bag, 24 ... Pump, 25a, 25b, 25c: electromagnetic valve, 26: control circuit, 26a, 26b: electromagnetic relay, 26c, 26d, 26e: switch.

Claims (1)

A back support device that is attached to a back frame of a seat back that forms a vehicle seat and that supports the back of a seated occupant together with the seat back. The back support device includes a central portion in the left and right width direction of the back frame. a first air bag located in a second, third airbag located on each side of the width direction of the left and right of the back frame, and the air pump to perform an air supply and discharge for the respective air bags An opening / closing valve that is disposed in a communication path between the air pump and the airbags and that is selectively opened when the air pump is driven.The airbags have respective ends at left and right portions of the back frame. that are positioned in parallel with each other mounted through the respective support plate for supporting the back of the bag body to a plate fixed to a predetermined width extending in the lateral direction Back support device in a vehicle seat, characterized.

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